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AP Physics 1

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What equation describes the distance that a dropped object falls "t" seconds after it started moving?

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Date created

Mar 14, 2020

Cards (41)

Section 1

(41 cards)

What equation describes the distance that a dropped object falls "t" seconds after it started moving?

Front

x=(1/2)at^2 Remember, the word "dropped" implies no initial velocity.

Back

What equation describes the speed in the x-direction of a projectile "t" seconds after it started moving?

Front

Vx=(Vxo)t ...Recall that there is no acceleration in the horizontal direction.

Back

What quantity is calculated from slope of the displacement versus time graph?

Front

velocity

Back

What is the y intercept of the velocity time graph?

Front

The initial velocity, (Vo in the formulas)

Back

How can total momentum be calculated?

Front

Adding the momentum of all the bodies.

Back

When is sum of force (net force) NOT zero.

Front

When a body's speed is changing.

Back

What is implied when an object is not accelerating in the x direction?

Front

The body is moving at a constant velocity

Back

What equation describes the speed of a dropped object "t" seconds after it started moving?

Front

V=Vo + at ...The word "dropped" means no initial velocity.

Back

What is impulse?

Front

Impulse is the change in momentum

Back

What is the area under the acceleration versus time graph?

Front

The CHANGE in velocity.

Back

What is the direction of the centripetal force?

Front

The centripetal force points along the radius towards the center of the circle.

Back

What is the area under the velocity time graph?

Front

Displacement

Back

How is a force's direction oriented compared to a bodies direction of motion to get a circular (curved) path of motion?

Front

The force is perpendicular to the motion to get a circular path of motion. (Think about centripetal force.)

Back

What is the horizontal acceleration of projectiles?

Front

ZERO

Back

What direction controls time in falling body and projectile motion problems?

Front

Vertical direction

Back

When is sum of force (net force) zero.

Front

When a body is moving at a constant velocity or not moving at all.

Back

What equation describes the speed in the y-direction of a projectile "t" seconds after it started moving?

Front

Vy=Vyo + gt ...Watch the signs.

Back

If you double the mass of one planet, triple the mass of another, and move them twice as far apart, what happens to the force of attraction between them?

Front

The new force is 2/4 or 1/2 times the old force. ...Because the force of gravity varies directly with the masses and inverse squared to the distance apart.

Back

A ball rolls inside a salad bowl. The ball is released along the top edge and rolls down before climbing to the same height on the opposite side of the bowl. What is the direction of the acceleration of the ball when it at the top edge of the bowl?

Front

It is towards the center and downwards a little. It is the sum of the normal force perpendicular to the bowl and the weight downwards.

Back

How does impulse relate to force?

Front

Impulse is (force)(time)

Back

What two entities comprise a vector?

Front

Magnitude and direction

Back

What is implied when an object is not accelerating in the y direction?

Front

g=zero so h=(Vyo)t

Back

What is the difference between elastic and inelastic collisions? State the relevant equations for each.

Front

kinetic energy is conserved for an elastic collision and not for an inelastic collision. ELASTIC: m1v1 + m2v2 = m1v1'+m1v2': INELASTIC: m1v1 + m2v2 = (m1+m1)v

Back

What is acceleration?

Front

How quickly you change velocity.

Back

What equation describes the distance that a horizontally launched projectile falls t seconds after it started moving?

Front

x=(1/2)at^2 ...Horizontal velocity does not affect the time of fall.

Back

What do you do with any vector that is not on either the x or y axis?

Front

Break it up into x and y components using trig, add up the components.

Back

What is the component of "mg" parallel to a slope?

Front

(mg)sin(angle)

Back

What is the derived equation for the ACCELERATION of gravity in terms of m and "r" squared?

Front

G(M:earth)/r^2 ...force of gravity = G(M:earth)(M:body)/r^2

Back

What does upward slope on a displacement versus time graph imply about the velocity.

Front

The velocity is positive

Back

How are velocity and speed different?

Front

Velocity has a direction and speed does not have direction.

Back

What do you know about two objects that are launched at different horizontal velocities?

Front

They fall, vertically, the by the same amount in the same time.

Back

How is sum of force (net force) depicted in a free body diagram?

Front

It is an arrow that DOES NOT touch the body. Recall that the net force is the answer when all the forces are added up.

Back

What force is always present, and what is its equation?

Front

Weight ...w=mg

Back

What is the general equation for motion down a slope and how does it change if the object is going up the slope?

Front

x=Vo + ((1/2)g)sin(angle)t^2

Back

What is the direction of the centripetal acceleration?

Front

The centripetal acceleration points along the radius towards the center of the circle. (Just like the centripetal force.)

Back

In uniform circular motion, how is tangential velocity calculated?

Front

2(pi)R/T ...Circumference/Period

Back

Mathematically what does centripetal force represent and how is centripetal force calculated?

Front

The centripetal force is the net force. It's magnitude is calculated from F=ma where "a" is the centripetal force.

Back

When is a normal force present, what is its direction?

Front

When the body rests on a surface.

Back

How is the centripetal force represented in a free body diagram?

Front

It is the net force pointing towards the center.

Back

A ball rolls inside a salad bowl. The ball is released along the top edge and rolls down before climbing to the same height on the opposite side of the bowl. What is the direction of the acceleration of the ball when it at the bottom of the bowl?

Front

The acceleration is towards the center. It is supplied by the normal force and points towards the center.

Back

How much work is the work done on an object moving in a circle? Why?

Front

Zero. Because the displacement is perpendicular to the force (centripetal force.)

Back